A mixture between sassy and feisty; while sassiness is often subconscious, sauciness is always deliberate. Sauciness tends to have sexual undertones. It's always good to be a little saucy. ;)

Girl 1: "Coconut Guy saw me in the elevator holding Cosmo mag and asked about the '10 Kinky Quickies' and I was like 'I already tested them all out.'"
Girl 2: "So. Saucy."

Girl 1: "So I got locked out of room in just a towel after taking a shower and ended up packed into an elevator with like 18 guys.. It could have been a porno."
Boy 1: "1 robe, 1 girl, 18 guys. What can they do with 12 floors?"
Girl 2: "OMG Sooo saucy."